Bit off topic , can't keep one of my forklifts (Moffett) running

It has many different OHSA inspired saftey cut offs and yeah, I thought about that too .. it doesn't just cut off quicky, it kinda stumbles then shuts down, leading me to believe its not that but, these ding ling drivers are always taking off and unhooking them so they don't to deal with safety belts or the arm guard or backup beeper and I RE-HOOK THEM